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This is the documentation for Cloudera Impala 2.1.x.
Documentation for other versions is available at Cloudera.com.

Query Options for the SET Statement

You can specify the following options
using the SET statement,
and those settings affect all queries issued from that session.

Some query options are useful in day-to-day operations for improving
usability, performance, or flexibility.

Other query options control special-purpose aspects of Impala operation
and are intended primarily for advanced debugging or troubleshooting.

Note:
In Impala 2.0 and later, you
can set query options directly through the
JDBC and ODBC interfaces by using the SET statement.
Formerly, SET was only available as command within the
impala-shell interpreter.